Lexus ES: ABS Pump Motor Control Circuit Short to Ground (C052C11,C052C13,C142719)
DESCRIPTION
The ABS motor relay is built into the brake actuator assembly.
When the skid control ECU (brake actuator assembly) operates ABS, TRAC, VSC, brake hold or brake assist, the ABS motor relay turns ON and drives the motor pump built into the brake actuator assembly.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C052C11 | ABS Pump Motor Control Circuit Short to Ground | When the voltage at terminal +BM is between 9.6 and 16.4 V, a short to ground in the ABS motor drive circuit is detected during the self test. | Skid control ECU (brake actuator assembly) |
| C052C13 | ABS Pump Motor Control Circuit Open | An open in the ABS motor drive circuit is detected during the self test. | Skid control ECU (brake actuator assembly) |
| C142719 | ABS Pump Motor Circuit Current Above Threshold |
| Skid control ECU (brake actuator assembly) |
| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | The ABS motor relay is operating. | ○ | ○ |
| Malfunction Status | An overload in the ABS motor relay is detected. | ○ | - |
| A short in the pump motor drive circuit is detected. | - | ○ | |
| Detection Time | 0.06 seconds or more. | 0.06 seconds or more. | |
| Number of Trips | 1 trip | 1 trip | |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
CAUTION / NOTICE / HINT
NOTICE:
After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and store system information memorization.
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PROCEDURE
| 1. | REPLACE BRAKE ACTUATOR ASSEMBLY |
(a) Replace the skid control ECU (brake actuator assembly).
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